Split out GrBitmapTextContext from GrTextContext.

include/gpu/GrBitmapTextContext.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrBitmapTextContext_DEFINED
+#define GrBitmapTextContext_DEFINED
+
+#include "GrTextContext.h"
+
+class GrTextStrike;
+
+/*
+ * This class implements GrTextContext using standard bitmap fonts
+ */
+class GrBitmapTextContext : public GrTextContext {
+public:
+    GrBitmapTextContext(GrContext*, const GrPaint&);
+    virtual ~GrBitmapTextContext();
+
+    virtual void drawPackedGlyph(GrGlyph::PackedID, GrFixed left, GrFixed top,
+                         GrFontScaler*) SK_OVERRIDE;
+
+    virtual void flush() SK_OVERRIDE;   // optional
+
+private:
+    GrTextStrike*   fStrike;
+
+    void flushGlyphs();                 // automatically called by destructor
+
+    enum {
+        kMinRequestedGlyphs      = 1,
+        kDefaultRequestedGlyphs  = 64,
+        kMinRequestedVerts       = kMinRequestedGlyphs * 4,
+        kDefaultRequestedVerts   = kDefaultRequestedGlyphs * 4,
+    };
+
+    SkPoint*                fVertices;
+    int32_t                 fMaxVertices;
+    GrTexture*              fCurrTexture;
+    int                     fCurrVertex;
+};
+
+#endif